31. The common-mode voltage gain is ….
(a) smaller than differential voltage gain
(b) equal to differential voltage gain
(c) greater than differential voltage gain
(d) none of the above
32. The input stage of an OP-amp is usually a ….
(a) differential amplifier
(b) class Bpush-pull amplifier
(c) CEamplifier
(d) swamped amplifier
33. The common-mode voltage gain of a differential amplifier is equal to RC divided by ….
(a) r′e
(b) 2 r′e
(c) r′e/2
(d) 2 RE
34. Current cannot flow to ground through ….
(a) a mechanical ground
(b) an a.c. ground
(c) a virtual ground
(d) an ordinary ground
35. What is the level of the current through the amplifier input(s) to ground in an op-amp?
(a) Virtually zero
(b) 1.7 mA
(c) 2.8 mA
(d) 3.3 mA
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